Malicious PDF — malware analysis report

Static analysis result for SHA-256 6b6385ba11c9ef14…

MALICIOUS

PDF

96.3 KB Created: 2021-09-04 19:27:31 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-07
MD5: ba2f82d10949e988770f2ab4f8b33fce SHA-1: f4f8991373ca012442ef789b9ea7e0e2ac8cd24d SHA-256: 6b6385ba11c9ef14fa75e622ca437cff779caab5f3a28ca077f9f44d6cb21a66
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

This PDF file was flagged by ClamAV as Pdf.Phishing.Trojan and by an ML classifier as malicious. It contains a link farm pointing to compromised WordPress upload storage and other disposable hosting, suggesting an attempt to distribute malicious content or phish users. The presence of multiple distinct hosts and the use of 'utm_term' parameters indicate a coordinated effort to obscure the final malicious destination.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9888

Heuristics 6

  • ClamAV: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • PDF link farm points to compromised-WordPress upload storage medium PDF_COMPROMISED_CMS_UPLOAD_LINK_FARM
    PDF contains multiple clickable links, across many distinct hosts, whose targets are random-slug files parked in the upload directories of vulnerable WordPress form plugins (FormCraft, Super Forms). This is the hallmark of the 'free document/template' SEO phishing PDF family, which ranks for search queries and routes users into payload/redirect chains hosted on compromised sites. The PDF itself carries no exploit — the risk is the linked destinations.
  • Small PDF is a non-clustered link farm on disposable hosting medium PDF_SEO_DISPOSABLE_LINK_FARM
    Small PDF contains many clickable external PDF links spread thin across many distinct hosts (no single dominant host), corroborated by a utm_term SEO-redirector link and/or links parked on free/disposable content hosts. This is the 'free document/template' SEO phishing PDF family, which ranks for search queries and routes users into payload/redirect chains, rather than a normal document citation pattern. The PDF itself carries no exploit — the risk is the linked destinations.
  • External URI info PDF_URI
    PDF contains an external URL action
  • Object number defined twice with different bodies info PDF_DUPLICATE_OBJ_BODY_INCREMENTAL
    The same indirect object (N G) is defined more than once with different body bytes. First-wins and last-wins readers will resolve different content, which is a parser-confusion shape used by targeted PDFs. Body-only differences are common in benign incremental updates, so severity is raised only when the duplicate carries active content.
  • Embedded URL info EMBEDDED_URL
    One or more URLs were extracted from the document. The URL itself is not a detection — see the per-URL labels for which channel (macro, JS, link annotation, document body, ...) reached each URL.
    URL https://estidevelopers.com/wp-content/plugins/super-forms/uploads/php/files/c25767396c0c67190029667adb61e79d/wefevej.pdf In PDF document text
    • https://www.capitalroofingct.com/wp-content/plugins/formcraft/file-upload/server/content/files/160e903a705a12---94266221266.pdfIn PDF document text
    • http://22vek-omsk.ru/fck_editor_files/files/tevajekebe.pdfIn PDF document text
    • http://phutunggiahungoto.com/uploads/files/86624973084.pdfIn PDF document text
    • http://giaoducvietnamtv.com/images/ckeditor/files/80860827505.pdfIn PDF document text
    • http://bpsstudio.hu/uploads/98735288050.pdfIn PDF document text
    • https://aquamedicasatumare.ro/ckfinder/userfiles/files/wefozinowebugolazew.pdfIn PDF document text
    • https://www.lowdoc-loans.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/160dee690da905---33788739970.pdfIn PDF document text
    • http://airconbank.com/upload/fckeditor/file/filejiwunifomak.pdfIn PDF document text
    • http://dabien.co.kr/wp-content/plugins/formcraft/file-upload/server/content/files/16093e6444680e---tolokigumagujif.pdfIn PDF document text
    • https://www.officinadelgustoroma.com/wp-content/plugins/super-forms/uploads/php/files/688a39c478c3d68b3b838fa1ff0d5e36/kitoporevax.pdfIn PDF document text
    • https://www.prowallpanama.com/wp-content/plugins/super-forms/uploads/php/files/2321fd9ccc2ba546587a7cfb550562c8/30173677706.pdfIn PDF document text
    • http://mintaialuminum.com/d/files/rafanuxurunil.pdfIn PDF document text
    • https://thesmithgrouphouston.com/wp-content/plugins/super-forms/uploads/php/files/5b8537e92795d81bd4b600d116a363aa/68514391141.pdfIn PDF document text
    • http://ridgefieldpark1967.com/clients/3/39/39eebdc8797e30ee23d4fd57d071fd44/File/59703407097.pdfIn PDF document text
    • https://locktactyuma.com/ckfinder/userfiles/files/20941842510.pdfIn PDF document text
    • http://sysquare.com/UserFiles/files/19872176751.pdfIn PDF document text
    • http://www.justgiveahand.org/wp-content/plugins/formcraft/file-upload/server/content/files/160a758892b316---80865541899.pdfIn PDF document text
    • http://chemonova.com/FCKeditor/file/geropinujifepitexodi.pdfIn PDF document text
    • https://harpethvalleyhealth.com/wp-content/plugins/super-forms/uploads/php/files/998c37a454c6f5a4a3248e40a1356bd3/tovaxukalajezaguvufosemo.pdfIn PDF document text
    • http://artwatch.ru/userfiles/file/2032673748.pdfIn PDF document text
    • http://aitrans.org/UploadFile/file/F1202109030707145946.pdfIn PDF document text
    • http://xn----7sbqwxdbhblh2h.xn--p1ai/data/file/57477941080.pdfIn PDF document text
    • https://kisikana.hr/userfiles/file/xugovitinitesewawawerebar.pdfIn PDF document text
    • https://encouragingmath.com/wp-content/plugins/super-forms/uploads/php/files/32519dc1b7a7ac73a64fd1bfdb0d08ca/7836795748.pdfIn PDF document text
    • http://vino-charlie.cz/userfiles/file/4135891372.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/3vuEKuznOb8/uplcv?utm_term=loratamed+bula+pdf+anvisaPDF link annotation
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#In PDF document text
    • http://purl.org/dc/elements/1.1/In PDF document text
    • http://ns.adobe.com/pdf/1.3/In PDF document text
    • http://ns.adobe.com/xap/1.0/In PDF document text
    • http://ns.adobe.com/xap/1.0/mm/In PDF document text
    • http://ns.adobe.com/xap/1.0/rights/In PDF document text
    • http://dejavu.sourceforge.netIn PDF document text
    • http://dejavu.sourceforge.net/wiki/index.php/LicenseIn PDF document text

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00010cbc.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10CBC 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off000124d3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x124D3 10920 bytes
SHA-256: d02ea6c3ef2292256282e0becc06c124df51cdd08e88c3fe6dc4272af52aa13e
font_02_sfnt_off00013de3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13DE3 20380 bytes
SHA-256: a0d52a9c97a90672e1c6de237acc22fb3be62326070f450daae40c1d74b732c5